Hi, ok I have smoked weed on and off for a long time. I will say that smoking tobacco to mix with the weed is never going to be a good thing and I am always concerned by the possibility of becoming a tobacco addict when people do that.
However, I am very pro the legalisation of cannabis not least because I have found my control and general well being is improved during the periods when I have had a regular supply of decent quality weed.
Having said that, everyone reacts differently. I don't think it is a coincidence that I have never had a "whitie" no matter how much I have consumed, I think my body just does really well with cannabis. Some people do not do so well and this should always be considered.
Just make sure you keep testing your blood when you smoke, just to keep an eye on things, try not to go over the top with sweet snacks and maybe try to get on top of your diabetes and used to dealing with it without being stoned for a while before deciding to mix the two up.
I do maintain though that for me, cannabis makes my control much better and also has a kind of vitalising effect over time.